Usagi is a crybaby, whiny, ditzy, walking disaster area. She doesn't take
fighting seriously (not at first anyway), and she always complains. However,
she is powerful as Sailormoon and has a kind heart. She is always willing
to save anyone rather than kill; in the R movie she gives up to Fioret rather
than let her friends die; in S she refuses to let the Outer Senshi destroy
Hotaru and Mistress 9; and in SuperS she leaps off a building high in the
sky to save a plummeting Chibimoon. Usagi is extremely naive, innocent, and
too trusting, as she tends not to know what is going on and trusts anybody
and everybody. (She thinks that Luna and Artemis are just 'good friends;'
she trusts the Starlights immediately.)

She is the first Sailor Senshi after Sailor V. Usagi was walking to school
one day when she happened to save a cat from being tortured. The cat in
actuality was Luna, and her job was to find the Sailor Senshi and the Moon
Princess. After a long series of complicated events, which included
finding the other four senshi, Usagi found out that she was Princess Serenity.

Usagi has three lives in a sense. In the past, she was Princess Serenity;
now she is Tsukino Usagi and Sailormoon, and in the future, she rules
Crystal Tokyo (a utopia) as Neo-Queen Serenity. Her lover, boyfriend, and
future husband (respectively) is Chiba Mamoru, otherwise known as Tuxedo
Kamen and Prince/King Endymion. Her child from the future is Chibi-Usa.

Usagi is the best possible leader of the Sailor Senshi, and the most important
person, obviously. She usually always ends up with the last attack to
destroy the monster of the day, and for the most part is the one that defeats
the final villain, though in SMS, that is debatable, as Saturn was actually
the one who might have been responsible for destroying Master Pharoah 90.

As Sailormoon, she has a variety of forms:

Sailormoon: Her first form in the
first season, R, and early S.

SuperSailormoon: Her forms in late
S and in SuperS.

Eternal Sailormoon: Her true form
that appears in SailorStars.

Sailormoon has, or has had, the following items:

Henshin Brooch

Pen (to transform into other people)

Communicator

Moon Stick

Ginzuishou

Crystal Compact

Cutie Moon Rod

Communicator Watch

Cosmic Heart Compact

Spiral Heart Moon Rod

Holy Grail

Crisis Moon Compact

Moon Kaleidoscope

Eternal Compact

Eternal Tier

Sailormoon also has a lot of attacks and powers:

Sailormoon:

Moon Prism Power, Make-Up: Her first
words to become Sailormoon using the brooch that Luna gives her

Moon Tiara Action: Moon's first attack
where she throws her tiara at the youma, destroying it

Moon Tiara Stardust: Her one time
attack that is essentially like Moon Tiara Action, only she sprinkles dust over
children that are possessed by funny rabbit-like enemies, healing them

Moon Healing Escalation: Her healing
power using the Moon Stick to revert the carriers of the nijizuishou back into
their human forms; also works on evil Endymion initially

Sailormoon Kick: Her own specially
named kick, in the fashion of Sailor V

Moon Power, Ni nare: What Usagi says
to transform into other people

Moon Prism Power: Princess Serenity
says this in her final battle against Beryl